First-Out Indication; Event Register - ABB SACO 16D3 User Manual And Technical Description

First-out indication

Event register

10
The annunciator unit is provided with a first-
out indication feature. The alarm channel which
operates first is indicated in the digital display
with a letter A and the channel number. The
first-out indication always relates to the first
Channel 1
Channel 2
Channel 3
Channel 16
Fig. 7. Principle of the first-out alarm indication.
For evaluating of disturbances, the alarm an-
nunciator unit has been provided with an event
register, which enables the incoming and disap-
pearing alarms to be read out. The register holds
9 events which can be read out on the digital
display step by step using the push-button ↑.
Acknowledge
Channel 1
Channel 2
Channel 3
Channel 16
Fig. 8. Operating principle of the event register.
incoming alarm after an annunciator acknowl-
edge/reset being performed. The first-out indi-
cation can be reset with the acknowledge/reset
push-button.
Reset
First-out
alarm
memory
The latest (youngest) information, i.e. address
No 9, is read out first and then the events are
represented in the display one by one until
address No 1, which represents the oldest infor-
mation, is reached.
Event
register
Digital display
Not used
Type of event
A = incoming alarm
Channel number
1...16
Digital display
Chronological order
Decimal point indicates first-
out alarm after previous
acknowledge
Type of event
A = incoming alarm
- = disappering alarm
- - - - = acknowledge
Channel number
1...16
The information of the event
register is read out with the
push button
Youngest event